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i want to change my heating and hot water programmer?

i want to change my programmer to one that allows me to run the hot water or heating independently,i have a landis and gyr programmer at the moment but dont know where to find the model number.
any help.
a mcgrath, September 2011
That depends on the type of heating system as well, you may not be able to if its an old system

bill, September 2011